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Note Allowance for loan losses (Average recorded investment and interest income recognized on impaired loans) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | $ 998,573 | $ 957,050
Interest Income Recognized | 34,685 | 24,448
Commercial multi-family | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 693 | 130
Interest Income Recognized | 50 | 4
CRE non-owner occupied | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 138,832 | 117,182
Interest Income Recognized | 5,742 | 4,745
CRE owner occupied | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 148,967 | 156,890
Interest Income Recognized | 6,528 | 4,939
Commercial and industrial | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 69,406 | 60,466
Interest Income Recognized | 4,097 | 1,899
Construction | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 11,659 |
Interest Income Recognized | 25 |
Mortgages | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 518,296 | 513,715
Interest Income Recognized | 17,828 | 12,861
Leasing | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 1,195 | 1,642
Interest Income Recognized | 0 | 0
Consumer | Credit cards | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 31,953 | 36,109
Interest Income Recognized | 0 | 0
Consumer | Home equity lines of credit | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 5,904 | 2,964
Interest Income Recognized | 0 | 0
Consumer | Personal Loan | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 69,007 | 64,972
Interest Income Recognized | 415 | 0
Consumer | Auto Loan | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 1,413 | 2,065
Interest Income Recognized | 0 | 0
Consumer | Other | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 1,248 | 915
Interest Income Recognized | 0 | 0
PUERTO RICO |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 973,076 | 944,575
Interest Income Recognized | 34,520 | 24,248
PUERTO RICO | Commercial multi-family | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 693 | 130
Interest Income Recognized | 50 | 4
PUERTO RICO | CRE non-owner occupied | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 138,832 | 117,182
Interest Income Recognized | 5,742 | 4,745
PUERTO RICO | CRE owner occupied | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 148,967 | 156,890
Interest Income Recognized | 6,528 | 4,939
PUERTO RICO | Commercial and industrial | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 69,406 | 60,466
Interest Income Recognized | 4,097 | 1,899
PUERTO RICO | Construction | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 2,094 |
Interest Income Recognized | 25 |
PUERTO RICO | Mortgages | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 509,038 | 504,709
Interest Income Recognized | 17,663 | 12,661
PUERTO RICO | Leasing | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 1,195 | 1,642
Interest Income Recognized | 0 | 0
PUERTO RICO | Consumer | Credit cards | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 31,953 | 36,109
Interest Income Recognized | 0 | 0
PUERTO RICO | Consumer | Home equity lines of credit | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
PUERTO RICO | Consumer | Personal Loan | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 68,237 | 64,467
Interest Income Recognized | 415 | 0
PUERTO RICO | Consumer | Auto Loan | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 1,413 | 2,065
Interest Income Recognized | 0 | 0
PUERTO RICO | Consumer | Other | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 1,248 | 915
Interest Income Recognized | 0 | 0
UNITED STATES |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 25,497 | 12,475
Interest Income Recognized | 165 | 200
UNITED STATES | Commercial multi-family | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
UNITED STATES | CRE non-owner occupied | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
UNITED STATES | CRE owner occupied | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
UNITED STATES | Commercial and industrial | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
UNITED STATES | Construction | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 9,565 |
Interest Income Recognized | 0 |
UNITED STATES | Mortgages | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 9,258 | 9,006
Interest Income Recognized | 165 | 200
UNITED STATES | Leasing | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
UNITED STATES | Consumer | Credit cards | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
UNITED STATES | Consumer | Home equity lines of credit | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 5,904 | 2,964
Interest Income Recognized | 0 | 0
UNITED STATES | Consumer | Personal Loan | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 770 | 505
Interest Income Recognized | 0 | 0
UNITED STATES | Consumer | Auto Loan | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
UNITED STATES | Consumer | Other | Non Covered Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 0 | 0
Interest Income Recognized | $ 0 | $ 0

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